From: Borislav Petkov <bp@alien8.de>
To: Tyler Baicar <tbaicar@codeaurora.org>
Cc: christoffer.dall@linaro.org, marc.zyngier@arm.com,
pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk,
catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net,
lenb@kernel.org, matt@codeblueprint.co.uk,
robert.moore@intel.com, lv.zheng@intel.com, nkaje@codeaurora.org,
zjzhang@codeaurora.org, mark.rutland@arm.com,
james.morse@arm.com, akpm@linux-foundation.org,
eun.taik.lee@samsung.com, sandeepa.s.prabhu@gmail.com,
labbott@redhat.com, shijie.huang@arm.com,
rruigrok@codeaurora.org, paul.gortmaker@windriver.com,
tn@semihalf.com, fu.wei@linaro.org, rostedt@goodmis.org,
bristot@redhat.com, linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-efi@vger.kernel.org, devel@acpica.org,
Suzuki.Poulose@arm.com, punit.agrawal@arm.com, astone@redhat.com,
harba@codeaurora.org, hanjun.guo@linaro.org,
john.garry@huawei.com, shiju.jose@huawei.com, joe@perches.com,
rafael@kernel.org, tony.luck@intel.com, gengdongjiu@huawei.com,
xiexiuqi@huawei.com
Subject: Re: [PATCH V15 11/11] arm/arm64: KVM: add guest SEA support
Date: Mon, 8 May 2017 19:40:58 +0200 [thread overview]
Message-ID: <20170508174058.5hbujeblxq5z6iwa@pd.tnic> (raw)
In-Reply-To: <1492556723-9189-12-git-send-email-tbaicar@codeaurora.org>
On Tue, Apr 18, 2017 at 05:05:23PM -0600, Tyler Baicar wrote:
> Currently external aborts are unsupported by the guest abort
> handling. Add handling for SEAs so that the host kernel reports
> SEAs which occur in the guest kernel.
>
> When an SEA occurs in the guest kernel, the guest exits and is
> routed to kvm_handle_guest_abort(). Prior to this patch, a print
> message of an unsupported FSC would be printed and nothing else
> would happen. With this patch, the code gets routed to the APEI
> handling of SEAs in the host kernel to report the SEA information.
>
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> Acked-by: Christoffer Dall <cdall@linaro.org>
...
> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> index 582a972..fd11855 100644
> --- a/arch/arm/kvm/mmu.c
> +++ b/arch/arm/kvm/mmu.c
> @@ -29,6 +29,7 @@
> #include <asm/kvm_asm.h>
> #include <asm/kvm_emulate.h>
> #include <asm/virt.h>
> +#include <asm/system_misc.h>
>
> #include "trace.h"
>
> @@ -1418,6 +1419,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
> kvm_set_pfn_accessed(pfn);
> }
>
> +static bool is_abort_sea(unsigned long fault_status) {
ERROR: open brace '{' following function declarations go on the next line
#107: FILE: arch/arm/kvm/mmu.c:1422:
+static bool is_abort_sea(unsigned long fault_status) {
...
> @@ -611,6 +612,24 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> };
>
> /*
> + * Handle Synchronous External Aborts that occur in a guest kernel.
> + *
> + * The return value will be zero if the SEA was successfully handled
> + * and non-zero if there was an error processing the error or there was
> + * no error to process.
> + */
> +int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +{
> + int ret = -ENOENT;
> +
> + if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> + ret = ghes_notify_sea();
> + }
WARNING: braces {} are not necessary for single statement blocks
#239: FILE: arch/arm64/mm/fault.c:625:
+ if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+ ret = ghes_notify_sea();
+ }
> +
> + return ret;
> +}
> +
> +/*
> * Dispatch a data abort to the relevant handler.
> */
> asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 612deb3..d286248 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -812,17 +812,18 @@ static int ghes_notify_sci(struct notifier_block *this,
> #ifdef CONFIG_ACPI_APEI_SEA
> static LIST_HEAD(ghes_sea);
>
> -void ghes_notify_sea(void)
> +int ghes_notify_sea(void)
> {
> struct ghes *ghes;
> + int ret = -ENOENT;
>
> - /*
> - * synchronize_rcu() will wait for nmi_exit(), so no need to
> - * rcu_read_lock().
> - */
> + rcu_read_lock();
> list_for_each_entry_rcu(ghes, &ghes_sea, list) {
> - ghes_proc(ghes);
> + if(!ghes_proc(ghes))
> + ret = 0;
What is the idea here: the first time ghes_proc() returns 0, ret is set
to 0 and all errors after it will be practically ignored. Looks like it
needs more love.
Also:
ERROR: space required before the open parenthesis '('
#271: FILE: drivers/acpi/apei/ghes.c:822:
+ if(!ghes_proc(ghes))
Please integrate scripts/checkpatch.pl in your patch creation workflow.
Some of the warnings/errors *actually* make sense.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2017-05-08 17:41 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-18 23:05 [PATCH V15 00/11] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64 Tyler Baicar
2017-04-18 23:05 ` [PATCH V15 01/11] acpi: apei: read ack upon ghes record consumption Tyler Baicar
2017-04-19 18:31 ` Borislav Petkov
2017-04-19 20:31 ` Baicar, Tyler
2017-04-19 20:41 ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 02/11] ras: acpi/apei: cper: add support for generic data v3 structure Tyler Baicar
2017-04-20 11:14 ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 03/11] cper: add timestamp print to CPER status printing Tyler Baicar
2017-04-21 12:21 ` Borislav Petkov
2017-04-21 16:04 ` Baicar, Tyler
2017-04-21 17:26 ` Borislav Petkov
2017-04-21 18:08 ` Baicar, Tyler
2017-04-21 18:12 ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 04/11] efi: parse ARM processor error Tyler Baicar
2017-04-21 17:55 ` Borislav Petkov
2017-04-21 18:22 ` Baicar, Tyler
2017-04-24 17:52 ` Borislav Petkov
2017-04-25 16:05 ` Baicar, Tyler
2017-04-25 16:31 ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 05/11] arm64: exception: handle Synchronous External Abort Tyler Baicar
2017-04-18 23:05 ` [PATCH V15 06/11] acpi: apei: handle SEA notification type for ARMv8 Tyler Baicar
2017-04-25 17:21 ` Borislav Petkov
2017-04-25 17:41 ` Baicar, Tyler
2017-04-25 17:46 ` Borislav Petkov
2017-05-08 17:28 ` James Morse
2017-05-08 19:59 ` Baicar, Tyler
2017-05-12 16:45 ` James Morse
2017-08-14 7:55 ` Xiongfeng Wang
2017-04-18 23:05 ` [PATCH V15 07/11] acpi: apei: panic OS with fatal error status block Tyler Baicar
2017-04-28 13:07 ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 08/11] efi: print unrecognized CPER section Tyler Baicar
2017-05-05 13:27 ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 09/11] ras: acpi / apei: generate trace event for " Tyler Baicar
2017-05-05 17:53 ` Borislav Petkov
2017-05-05 18:44 ` Steven Rostedt
2017-04-18 23:05 ` [PATCH V15 10/11] trace, ras: add ARM processor error trace event Tyler Baicar
2017-05-08 17:34 ` Borislav Petkov
2017-04-18 23:05 ` [PATCH V15 11/11] arm/arm64: KVM: add guest SEA support Tyler Baicar
2017-05-08 17:40 ` Borislav Petkov [this message]
2017-05-08 19:54 ` Baicar, Tyler
2017-05-08 20:22 ` Borislav Petkov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170508174058.5hbujeblxq5z6iwa@pd.tnic \
--to=bp@alien8.de \
--cc=Suzuki.Poulose@arm.com \
--cc=akpm@linux-foundation.org \
--cc=astone@redhat.com \
--cc=bristot@redhat.com \
--cc=catalin.marinas@arm.com \
--cc=christoffer.dall@linaro.org \
--cc=devel@acpica.org \
--cc=eun.taik.lee@samsung.com \
--cc=fu.wei@linaro.org \
--cc=gengdongjiu@huawei.com \
--cc=hanjun.guo@linaro.org \
--cc=harba@codeaurora.org \
--cc=james.morse@arm.com \
--cc=joe@perches.com \
--cc=john.garry@huawei.com \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=labbott@redhat.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=lv.zheng@intel.com \
--cc=marc.zyngier@arm.com \
--cc=mark.rutland@arm.com \
--cc=matt@codeblueprint.co.uk \
--cc=nkaje@codeaurora.org \
--cc=paul.gortmaker@windriver.com \
--cc=pbonzini@redhat.com \
--cc=punit.agrawal@arm.com \
--cc=rafael@kernel.org \
--cc=rjw@rjwysocki.net \
--cc=rkrcmar@redhat.com \
--cc=robert.moore@intel.com \
--cc=rostedt@goodmis.org \
--cc=rruigrok@codeaurora.org \
--cc=sandeepa.s.prabhu@gmail.com \
--cc=shijie.huang@arm.com \
--cc=shiju.jose@huawei.com \
--cc=tbaicar@codeaurora.org \
--cc=tn@semihalf.com \
--cc=tony.luck@intel.com \
--cc=will.deacon@arm.com \
--cc=xiexiuqi@huawei.com \
--cc=zjzhang@codeaurora.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).